If you are the one to leave the shared home, make sure you take copies of past tax returns (unless you have them stored by an accountant or on line--I did not.)
I've been asked by a background investigation company to provide a W-2 or pay stub from a company that I left more than 10 years ago! Technically, you don't have to keep tax returns more than 7 years, but in reality, I was a bit anal about finances, so I would have this--but it's 2500 miles away with the X.
I'm not sure how I'll resolve this; not even sure I'll have to--I've been in the job for a week now. But it's something I didn't think about when I separated.